Bill Davidsen <davidsen@xxxxxxx> wrote: > Sebastian Kuzminsky wrote: > > >Now it works, but I dont trust it one bit. > > > >I had been seeing almost immediate, perfectly repeatable hard lockups > >in 2.6.15-rc5 and 2.6.15-rc5-mm3, when using sata_mv, RAID, and LVM > >together. Nothing in the syslog or on the console, and the system is > >totally unresponsive to the keyboard & network. > > > >My hardware setup is: four Seagate Barracuda 500 GB disks, on a Marvell > >MV88SX6081 8-port SATA-II PCI-X controller, on a PCI-X bus (64/66). > > > >The disks work great when accessed directly. They work great when used > >as four PVs for LVM, and when assembled into a 4-disk RAID-6. > > > >But when I make a RAID-6 array out of them, and use the array as a PV, > >the system would hang completely, within seconds. (This is with LVM > >2.02.01, libdevicemapper 1.02.02, and dm-driver 4.5.0.) > > > >I turned on all the debugging options in the kernel config hoping to get > >some insight, but this "debug" kernel doesnt crash. It's running fine, > >and I'm pounding on it. A timing problem in the interaction between > >LVM and RAID? Some kind of wierd heisenbug.... > > > > > >I'd be happy to do any debugging tests people suggest. > > > > > > > > > I've been waiting for more info on this, did it get fixed? 2.6.15? Still broken in 2.6.15. With all the debugging options OFF in the config, the system stayed up < 24 hours under load, then a hard lockup like before: nothing on the console, magic sysrq doesnt work, no caps-lock, no ping. Note that this is different from before: it actually ran a little bit before locking up, rather than locking up within seconds like it did with 2.6.15-rc5. With all the debugging options ON, it's stayed up for 3+ days now (and still running) with no problems. Any suggestions for how to debug this are welcome! ;-) -- Sebastian Kuzminsky - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html